Senior AI Full Stack Engineer for Relay

Who We Are

Blackbird Lab is a software development company. While we are practicing an international working culture, we are proud representatives of Ukrainian values and traditions. We are a team of 90+ energetic, curious, smart, and open to new challenges tech pros who prefer efficient async communication, flexible working hours, a co-working office model, etc.

Being in this craft for 7+ years, we managed to accumulate expertise and bring value to a number of clients. We cooperate with US and Canadian product companies of different sizes, from small startups to established products, in close, trusted relationships.

All team members, including management, have an engineering background. The process, participants who speak the same language and have a similar approach based on technical principles, is always efficient. It is way easier to make decisions and introduce new features in a team with engineering at heart. It is the technical DNA that lets us build high-quality products that facilitate the lives of our customers’ users.

Position & client

As part of the Blackbird team, you will be responsible for building internal tools and improving the developer experience for an existing React application. The app is already used by 50,000+ users across Canada.

The client’s development organization is structured into cross-functional product pods that deliver features across both web and mobile platforms. Our team focuses on streamlining development operations and empowering all engineers to contribute to the mobile codebase confidently.

Our client is a fast-growing Canadian fintech company that builds an online business banking and cash-flow management platform designed to help small and growing businesses better manage their finances. The company’s mission is to provide business owners with clear visibility into earnings, expenses, and savings so they can operate more efficiently and make smarter financial decisions.

Stack of the project

• TypeScript, Node.js, Express.
• React, React Router, React Hook Form, Zod.
• Redux, Redux-Saga, RTK Query.
• SCSS Modules, Sass, Radix UI.
• Webpack, Babel.
• REST API, Axios, WebSocket, Webhooks.
• Sequelize, PostgreSQL, Redis.
• AWS (S3, SNS, SQS, DynamoDB, Lambda), LaunchDarkly.
• Jest, React Testing Library.
• ESLint, Prettier, Husky.
• Docker, GitHub Actions, Git.
• Performance Profiling/Optimization.
  
  

Responsibilities

• Develop and maintain the platform that enables other development teams to build new features.
• Manage the integration of features contributed by other teams into the main project.
• Oversee and execute release processes to ensure smooth delivery of updates.
  
  

Requirements

• 5+ years of development experience with React.
• Strong knowledge of JavaScript/TypeScript, ES6+ features.
• Hands-on experience with AI Coding agents like Claude, Codex, Cursor.
• Practical experience with CI/CD pipelines, automated testing.
• Upper-Intermediate English speaking level.
• Fluent in Ukrainian.
  
  

Team setup & processes

• Engineering Manager (Ukraine)
• Senior Full Stack Engineer (Poland)
• Middle Full Stack Engineer - open position
  
  

Interview process

• HR interview (30 min)
• Interview with an Engineering Manager (30 min)
• Tech interview (60 min)
  
  

Benefits

We are all for the self-development of each team member. As a part of our team, you’ll be supported in your professional growth, work on Macs, receive certifications, and visit conferences. On top of that, you will enjoy an attractive social package, including

• Сompetitive monthly compensation
• Flexible working schedule
• Working remotely
• 18 paid vacation working days
• Paid sick leave (with 5 undocumented days per year)
• Health support with medical insurance or sports programs
• English lessons, sports activities, and charity events
• Full support of Private Entrepreneur reporting services (ФОП)